Abrasive element



@Ct. 25, 1932. WEIL 1 1,884,436

ABRAS IVE ELEMENT Filed June 19, 1930 1 1 INVENTOR 5 a EDWARD J. WE/L.

' ATTORNEY warn or na'rnerr, momenta, nssreiroa re onarstna or nnraorr, MICHIGAN, a conroaarrorror n w annnsivn ELEEEENE Application filed (lane 13,

objects of this invention are to provide an improved abrasive element, parti-eniarly a grinding and polishing disc; to provide a disc of this kind which is yieldable 5 and has suficient firmness to bear against a piece of work with a substantial pressure; to provide a base in an abrasive disc which 1s resilient and capable of restoring the disc to its initial shape after it has been deflected by a piece of work during grinding operations; and to provide a metal reinforcing structure in a disc of this kind having a uniformly foraminous area to which an abrasive substance maybe rigidly bonded.

An illustrative embodiment of m invention is shown in the accompanying rawing, in which Fig. 1 is a top plan view of an abrasive disc embodying my invention.

Fig. 2 is an enlarged section taken on line 2-2 of Fig. 1. r

Fig. 3 is a section similar to Fig. 2, showing a modified form of my invention.

Fig. 4 is an enlarged section showing another form of my invention.

Fig. 5 is an enlarged section showing a further development of my invention.

In the form shown, in Figs. 1 and 2, the abrasive element comprises superimposed layers of granular abrasive material 1, cloth 2, wire screen 3 having a'comparatively fine mesh and paper 4. The layers of wire screen cloth and paper are circular in sha e an are rigidly bonded together by abrasive material 5 which is impregnated in the pores of the screen 3 so as to secure the cloth 2 onone side of the screen and the paper 4 on the other side thereof. The granular abrasive 1 is imbedded in a layer of adhesive 6 on the outer surface of the cloth 2. Formed in the center of the disc is an aperture 7 through which the driving member of a rotary rinding or polishing machine may be exten ed.

In manufacturing abrasive discs of this kind, wire screen comprising brass, copper,

19%. Serial Eio. 69.32?-

bronze, steel or'other yieldable and reslient metals is preferably tinned with solder or babbitt which prepares the screen for receiving a layer of adhesive material, protects it a ainst rusting, and also secures the strands 59 0? wire together so as to prevent fraying. The screen is then coated with adhesive material suchas glue, varnish, or shellac. Before the adhesive is allowed to set the paper backing 4 may be applied on one side of the screen and the cloth 2may beplaced on the other side thereof. This cloth preferably has a layer of granular abrasive material bonded to its outer surface before it is placed upon the screen. The disc is then cured to render an it flexible by a moderate heat treatment.

In the form of my invention shown in Fig. 3, the wire screen 8 is tinned as described above and while the adhesive 9 thereon is unset, a layer of granular abrasive materiallO a is applied directly upon one side of the screen and imbedded in the adhesive 9. The adhesive coating permeates through the pores of the screen and forms a substantially smooth backing on the disc.

The disc illustrated in Fig. 4, com rises a wire screen member 11, the pores 0 which are completely filled with an adhesive 12 and a layer of cloth 13 which is bonded by adhesive 12 to one surface of the screen 11. A layer of adhesive 14 is provided on the outer side of the cloth 13 in which granular abrasive material 15 is imbedded.

The abrasive disc shown in Fig. 5 comprises superimposed layers of abrasive 10', I adhesive 9 and wire screen 8 which are secured together in the manner described in connection with Fig. 3. This form of my invention has a paper backing 16 which is secured to the wire screen 8 by the adhesive 9'.

\ Although but one specific embodiment of this invention has herein been shown and described, it will be understood that various changes including the size, shape and ar- 90 other than by the terms of the appended rangement of parts, may be made without departing from the spirit of my invention and it is not my'intention to limit its scope claim.

I claim:

In an abrasive element comprising a wire screen base, an alloy covering the strands of said screen and firmly securing the same in place, a coating of an adhesive material on said screen, and an abrasive means secured thereto by said adhesive material.

EDWARD J. WEIL. 

